Tests on the efficiency of mixtures of methyl bromide and phoshine to Khapra Beetle (Trogoderma granarium Everts)

Abstract

Investigations carried out in the laboratory at 29, 25, 12, and 0°C as well as 75±5% relative humidity about the toxicity of mixtures of methyl bromide and phoshine to larvae and pupae of Khapra Beetle showed that the lethal times (LT) required for killing the larvae and pupae with a combined fumigation of these two gases are considerably reduced. Also it was found that pupae are less susceptible than larvae to CH3Br and PH3 alone as well as to a mixture of these two gases.

Furthermore, experimental results indicate that, in a combined fumigation of methyl bromide and phosphine, these two gases do not affect each other, but act independently, showing an additive, in some cases even a potentiated action. In addition to the improvement of the biological action of the gases by this method, a combined fumigation has the advantage of reducing the dosage of methyl bromide so that the residual effect can be restricted to a minimum on foodstuffs, especially for products with a high rate of sorption to methyl bromide such as expeller and extracted by-products of oil-seeds.

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Literaturverzeichnis

Bond, E. J.;Buckland, C. T., 1976: Control of insects with fumigants at low temperatures: Toxicity of mixtures of methyl bromide and acrylonitrile to three species of insects. J. econ. Ent.69 (6), 725–727.Google Scholar